var websocket = null;
layui.use(['layer','jquery'], function(){
    var $ = jQuery = layui.$;
    var layer = layui.layer;
//判断当前浏览器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://127.0.0.1/webSocket");
    } else {
        layer.msg('当前浏览器不支持在线聊天')
    }

//连接发生错误的回调方法
    websocket.onerror = function () {
       layer.msg("连接发生错误");
    };

//连接成功建立的回调方法
    websocket.onopen = function () {
        layer.msg("连接成功");
    }

//接收到消息的回调方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML(event.data);
    }

//连接关闭的回调方法
    websocket.onclose = function () {
        layer.msg("关闭连接");
    }

//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function () {
        closeWebSocket();
    }

//将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        var html = $("#message").html();
        html = innerHTML + '<br/>';;
        $("#message").append(html);
        var div = document.getElementById("message");
        div.scrollTop = div.scrollHeight;
    }

//关闭WebSocket连接
    function closeWebSocket() {
        websocket.close();
    }
    $("#send").click(function () {
        sendmessages()
    });
    $('body').keydown(function(event) {
        if (event.which == 13) {
            sendmessages();
        }
    });

    function sendmessages() {
        var message = document.getElementById('text').value;
        $("#text").val(null);
        if (message != "") {
            $("#msg").html("")
            var _adrobj = message.replace(/\"/g,"'");
            websocket.send("{\"messages\":\""+_adrobj+"\",\"username\":\""+$("#acc").text()+"\"}");
        }else{
            layer.msg("请输入内容")
        }
        $("#text").val("").focus();
    }
});
